The question is "What's Stella's opportunity cost of working on her serve for an hour?" The rest of the info looks like it's meant to confuse you. They charge $10 an hour. She values an hour of her time at $20. I believe that means she would pay $20. Hope this helps!
Since the slope is falling, instead of rising, it would be negative.
Now, on the line, I plotted (0, 2) and (-2, 10).
You would now plug this into the rise/run formula.
The formula is

The equation would become,

=

=
-4I believe the answer would be
-4.
I hope this helps!
I think it's A becaouse the answer I got was very close to the answer of A so it's A I think. Im just tying to help c:
If length AM = AK then it is isosceles.
M(-1,-6), A(-4,5)
AM=((5-(-6))²+(-4-(-1)))^(1/2)=11.401
A(-4,5) and K(5,-2)
AK=((-2-5)²+(5+4)²)^(1/2)=11.401
so the triangle is isosceles.